зеркало из https://github.com/mozilla/gecko-dev.git
79 строки
2.6 KiB
C++
79 строки
2.6 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef JoinNodeTransaction_h
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#define JoinNodeTransaction_h
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#include "mozilla/EditTransactionBase.h" // for EditTransactionBase, etc.
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#include "nsCOMPtr.h" // for nsCOMPtr
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#include "nsCycleCollectionParticipant.h"
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#include "nsID.h" // for REFNSIID
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#include "nscore.h" // for NS_IMETHOD
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class nsIContent;
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class nsINode;
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namespace mozilla {
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class HTMLEditor;
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/**
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* A transaction that joins two nodes E1 (left node) and E2 (right node) into a
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* single node E. The children of E are the children of E1 followed by the
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* children of E2. After DoTransaction() and RedoTransaction(), E1 is removed
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* from the content tree and E2 remains.
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*/
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class JoinNodeTransaction final : public EditTransactionBase {
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protected:
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JoinNodeTransaction(HTMLEditor& aHTMLEditor, nsIContent& aLeftContent,
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nsIContent& aRightContent);
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public:
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/**
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* Creates a join node transaction. This returns nullptr if cannot join the
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* nodes.
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*
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* @param aHTMLEditor The provider of core editing operations.
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* @param aLeftContent The first of two nodes to join.
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* @param aRightContent The second of two nodes to join.
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*/
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static already_AddRefed<JoinNodeTransaction> MaybeCreate(
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HTMLEditor& aHTMLEditor, nsIContent& aLeftContent,
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nsIContent& aRightContent);
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/**
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* CanDoIt() returns true if there are enough members and can join or
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* restore the nodes. Otherwise, false.
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*/
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bool CanDoIt() const;
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NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(JoinNodeTransaction,
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EditTransactionBase)
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NS_IMETHOD QueryInterface(REFNSIID aIID, void** aInstancePtr) override;
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NS_DECL_EDITTRANSACTIONBASE
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NS_DECL_EDITTRANSACTIONBASE_GETASMETHODS_OVERRIDE(JoinNodeTransaction)
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protected:
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RefPtr<HTMLEditor> mHTMLEditor;
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// The nodes to operate upon. After the merge, mRightContent remains and
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// mLeftContent is removed from the content tree.
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nsCOMPtr<nsIContent> mLeftContent;
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nsCOMPtr<nsIContent> mRightContent;
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// The offset into mNode where the children of mElement are split (for
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// undo). mOffset is the index of the first child in the right node. -1
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// means the left node had no children.
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uint32_t mOffset;
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// The parent node containing mLeftContent and mRightContent.
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nsCOMPtr<nsINode> mParentNode;
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};
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} // namespace mozilla
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#endif // #ifndef JoinNodeTransaction_h
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